836 MHz/1.95GHz Dual-Band Class-E Power Amplifier Using Composite Right/Left-Handed Transmission Lines

Ji, Seung Hun; Hwang, Gyu Weon; Cho, Choon; Lee, Jae; Kim, Jaeheung

doi:10.1109/eumc.2006.281347

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…5 shows the overall circuit. For phase converter, the composite right/lefthanded transmission line (CRLH-TL) was utilized [7][8]. Table I shows component values of CRLH-TL for this design.…”

Section: Duty-cycle Modulationmentioning

confidence: 99%

“…Table I shows component values of CRLH-TL for this design. In this work, CRLH-TL is employed to convert the phase at the second and third harmonics [7][8]. However, since the auxiliary power amplifier makes overall PAE decrease, it should not have an impact on the fundamental component of main power amplifier and not much consume the DC power.…”

Section: Duty-cycle Modulationmentioning

confidence: 99%

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Linearity Enhancement for the RF Class-E Power Amplifiers Using Duty-Cycle Modulation at the Feed-Forward Path

Eun

Cho

Lee

et al. 2008

2008 38th European Microwave Conference

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A linearity improved class-E power amplifier using duty-cycle modulation(DCM) is proposed at 2.4 GHz. The main class-E amplifier is combined with the auxiliary duty-cycle modulated class-E amplifier to enhance the linearity with suppressing the harmonics. The duty-cycle modulation is employed for the auxiliary amplifier to generate harmonics which cancel the main amplifier's harmonics at the combiner. It is important to create the harmonics needed to suppress the main amplifier's harmonics by controlling gate voltage of the auxiliary amplifier. The measured maximum output power at the fundamental frequency shows 28.8 dBm, whereas the PAE shows 53 % with 14 dBm input power excited. The ACPR is improved by 12 dB compared to that of the class-E amplifier without duty-cycle modulation.

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Section: Duty-cycle Modulationmentioning

confidence: 99%

Section: Duty-cycle Modulationmentioning

confidence: 99%

Linearity Enhancement for the RF Class-E Power Amplifiers Using Duty-Cycle Modulation at the Feed-Forward Path

Eun

Cho

Lee

et al. 2008

2008 38th European Microwave Conference

Self Cite

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show abstract

“…For dual-band operation, the use of a single L-type section of a series CRLH TL and an open-circuit shunt CRLH stub, Figure 3, as reported in [6] would not be sufficient to simultaneously meet the necessary and sufficient Class-E impedance condition, i.e. R ϩ jX at f 1 , f 2 and an open circuit at 2f 1 , 2f 2 , due to the nonlinear phase response of the LH TL.…”

Section: Dual-band Class-e Amplifier Termination Synthesismentioning

confidence: 99%

“…The dispersion characteristics of these can be manipulated in such a way that a desired electrical length at two arbitrarily assigned frequencies is obtained [5]. Recently, a description for a dual-band Class-E power amplifier using CRLH TLs was discussed in [6]. However the design procedures used to synthesise appropriate CRLH TLs for Class-E applications were not given.…”

Section: Introductionmentioning

confidence: 99%

“…However the design procedures used to synthesise appropriate CRLH TLs for Class-E applications were not given. More importantly the fact that the Class-E power amplifier requires different load-network impedances for funda- mental and higher harmonic frequencies was not taken into consideration in [6]. The importance of this second point was illustrated in [7].…”

Section: Introductionmentioning

confidence: 99%

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Design strategies for dual‐band Class‐E power amplifier using composite right/left‐handed transmission lines

Thian

Fusco

2007

Micro & Optical Tech Letters

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In this article we propose a technique for dual‐band Class‐E power amplifier design using composite right/left‐handed transmission lines, CRLH TLs. Design equations are presented and design procedures are elaborated. Because of the nonlinear phase dispersion characteristic of CRLH TLs, the single previous attempt at applying this method to dual band Class‐E amplifier design was not sufficient to simultaneously satisfy the minimum requirement of Class‐E impedances at both the fundamental and the second harmonic frequencies. This article rectifies this situation. A design example illustrating the synthesis procedure for a 0.5W‐5V dual band Class‐E amplifier circuit simultaneously operated at 900 MHz and 2.4 GHz is given and compared with ADS simulation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2784–2788, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22836

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Composite right/left‐handed transmission lines in use for ultra‐wideband matching of front‐end amplifiers with modified cuckoo search optimization

Güneş

Karataev

Demi̇rel

2016

Int J Numerical Modelling

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Summary In this work, the broadband capability of composite right/left‐handed transmission lines (CRLH TLs) in the balanced condition is exploited for ultra‐wideband matching of a compact single transistor front‐end amplifier. For this purpose, the LC element values and the number of identical asymmetric CRLH TL cells are taken as optimization variables. The minimum noise and maximum power delivery at each operation frequency of the chosen high technology transistor are considered as the feasible design target provided that the stability of the transistor is ensured. This feasible design target is expressed simply by a single objective function in terms of the port impedances of the input and output matching circuits together with the realization conditions of the CRLH TLs. Thus, human efforts for the design optimization process are reduced as much as possible. A novel metaheuristic algorithm ‘modified cuckoo search’ is used as a fast and accurate tool to find out ‘the global optimum’ within the feasible design variable space in the design procedure. In the study case, BPF640 is chosen as a high performance low‐noise microwave transistor. The design optimization results in a low‐noise amplifier using a single CRLH TL cell input and output matching circuits provided that a good agreement is obtained with the targetted performance and verified by Applied Wave Research, Inc. (AWR) simulation software. Thus, it can be concluded that CRLH TLs enable a designer to design high‐performance miniaturized low‐noise amplifiers. Copyright © 2016 John Wiley & Sons, Ltd.

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836 MHz/1.95GHz Dual-Band Class-E Power Amplifier Using Composite Right/Left-Handed Transmission Lines

Cited by 12 publications

References 6 publications

Linearity Enhancement for the RF Class-E Power Amplifiers Using Duty-Cycle Modulation at the Feed-Forward Path

Linearity Enhancement for the RF Class-E Power Amplifiers Using Duty-Cycle Modulation at the Feed-Forward Path

Design strategies for dual‐band Class‐E power amplifier using composite right/left‐handed transmission lines

Composite right/left‐handed transmission lines in use for ultra‐wideband matching of front‐end amplifiers with modified cuckoo search optimization

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